Interesting that you point this out. I don't think the evidence is that strong (so it's hard to make an affirmative) but there's some indication that the game had some staffing troubles. Look at this quote from Hoshino (from the Sega-16 post Gryson linked above): Hoshino doesn't appear to be the only developer to work on both Knuckles' Chaotix and Nights into Dreams. In fact, a total of 10 developers worked on both: obviously Ohshima and Hoshino, but also Hataya, Watanuki, Miyake, Makino, Ryo Kudo, Saori Wada, Atsumu Miyazawa, and Tatsuya Kōzaki. That's not a negligible amount of people. It begs the question: how many of these people were working on Chaotix but got reassigned to Nights? I doubt Hoshino was the only one. Then there's Masato Nishimura's tweets. He claims Clackers was canceled, something we know isn't true - it came out as Knuckles' Chaotix. And after posting this, Zetaman on TCRF found two more Nishimura tweets (November 2011 and November 2012) where he talks about the Special Stages. Here are machine translations (again, if someone can provide a more accurate translation, please do!): Nishimura confirms that the wireframe special stages had been in the game back when it was on the Genesis, but again claims the game was canceled in the second tweet. (And remember, he mentions the cancellation was caused by "SOA issues", which is why I don't think Kalinske's comment should be discarded. If there was a dispute between SOA and SOJ that affected a major Sonic game, I'm certain Kalinske would have knowledge of that, and I doubt he'd conflate two entirely separate projects (Sonic 3 and Sonic X-treme) developed years apart.) And the way he describes the game makes it sound like he isn't even aware it was released in any form. Perhaps he was reassigned from the project as well? It almost makes me think the game was finished by a completely different team from the one that started it in the first place. This could explain why Hoshino doesn't mention any Saturn version (he left before it became a Saturn game), and why Chaotix credits three directors and not just one, like the other Genesis-era Sonic games. Hell, it could explain why Chaotix credits so many people. Chaotix credits 88 people, an unusually large number for the time. In fact, of the classic Sonic games, the only ones that credit more are Sonic CD, which credits 120, and Sonic 3, which credits 100.